Fix FlatMap implementation in Result type #10403
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For a Result[T], FlatMap should apply f when the result is Ok, and propagate the error unchanged when it's Err. The original code returns r on Ok and tries to use r.left when Err, which is wrong. This commit fixes that. Secondly, the group of FlatMap/AndThen and OrElse functions and methods are now properly tested with new unit tests. fixes lightningnetwork#10401
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The
FlatMapmethod for theResulttype has been corrected to apply the provided function when the result isOkand propagate the error unchanged when it isErr.Comprehensive unit tests have been added to ensure proper functionality of FlatMap, AndThen, and OrElse methods.
Fixes #10401